Steam-generating boiler



Nov. 2 1926.

H. J. MATTHEWS STEAM GENERATING BOILER Filed August 23, 1924 QPS" m mw 3M m un Patented Nov. 2, 1926.

UNITED STATES HAROLD J. MATTHEWS, 0F VANCOUVER, CANADA.

STEAMr-GENEBATING BUTLER.

Application tiled August 23. 1924. SerialNo. 7325.817.

This invention relates to a steam generating boiler off the vertical, multitubular class which has been specially designed for use with logging engines. but is applicable to any hauling or winding engine where the boiler is seated between the side frames of the engine and the width between these trames is to a large extent standardized.

YVhere a cylindrical boiler is applied to such an engine its diameter is necessarily limited to the space between the trames, and that limitation frequently prevents an adequate boiler being` furnished to meet the present day requirements of such engines.

lVhere a cylindrical boiler so limited is insuiiicient ttor the engine requirements, attempt has been .made to overcome the restriction by lengthwise enlarging the'tire-box betweenv the trames. Although this elongation ot the lire-box a ll'ords an increased grate area, an enlarged combustion chamber and a corresponding slight increase ot the heating surface, so long as the boiler above the tireboX remains cylindrical, the full advantage ot this enlargement ot the fire-box is not utilized, because the available tube area and water and steam space is still subject to the cylindrical restriction, and further, owing to the offset at the junction of the elongated fire-box to the cylindrical boiler shell, a serions obstruction is oiiiered at the junction ott set to the passage o'i" steam generated in the water space surrounding the lire-box to the steam space of the cylindrical shell.

In the boiler, which is the subject ot this application, the shell, throughout its entire height, is elongated in its cross section to fully utilize the space available between the engine side frames. The tire-box being correspondingly enlarged, its crown plate and the upper end plate ot the boiler shell which constitutes the tube plates of the boiler, provide accommodation for an increased number ot tubes, whereby an increased steam generating surface and a greater water space are rendered available.

The walls ot the irebox are suitably stayed to the correspondingly shaped outer shell, and the flattened portions of the boiler shell above the fire-box are directly'stayed to one another by plate stays that will not restrict the water space or interfere with the circulation, but afford a straight line flow throughout.

A boiler so designed may be used in the restricted space available and be efliciently and practically stayed that the flat sides of the shell may have a pressure efiiciency not less than that of the longitudinal seams of the boiler, whereby the allowable working pressure will be the same on all parts of the boiler shell. v

The invention is particularly described in the following specification, reference being made to the drawings by which it is accom; panied, in which: v i

F lf is a sectional plan inverted on the line 11 in Fig. 2, and

Fig. 2 is a vertical section on the line `2 2 in Fig. l. i

In these drawings 2, 3 representthe boiler shell, `2 being the semiecylindrical portions, the di ameteil ot which or shorter axis of the cross section corresponds approximately to the distance between the side trames of the engine, land 3 are the flat portions connecting the portions 2 and lengthwise enlarging the cross section area of the boiler shell'.

This cross section area of the boiler shell is uniform throughout the entire height of the boiler from the lower edge t adjacent the grate to the upper tube plate 5. Within the lower part of this shell 2, 3 is a similarly shaped fire-box 6 preserving a water spa-ce 7 between it and the shell 2, 3. The tubes 8 extend between the lower tube plate 9 which forms the crown of the tire-box 6 and the upper tube plate 5 which forms the head of the boiler shell 2, 3.

The wall 6 of the {ire-box is stayed to the outer shell 2, 8 by the customary stays 10 screwed or otherwise secured and pitched the required distance apart to stand the pressure imposed on the boiler. Above the tire-box the flat areas 3 of the shell are tied together by plate stays 11 which are spaced between the tubes and are secured to the shell between angle irons 12 riveted thereto.

In the upper end of the boiler immediately below the upper tube plate 5, a dry pipe 15 is secured across between the flat sides 3, which pipe is bent upwards as close as practicabley to the upper tube plate and is perforated along the upper side; whereby dry steam may be drawn from the boiler to either one or both sides as desired.

A boiler of this class is thus provided which is adapted to a laterally Arestricted dimension and has withal a heating surface and a water space which are considerably in excess of what is obtainable in existing practice, which requires the shell ot a boiler to vand that surrounding the tubes, and also allows a more uniform draught through the tubes, are in themselves most desirable attainments.

Although in the drawings the tubes 8 are spaced apart where the plate stays lO between the flattened sides 3 of the boiler shell pass, it must be understood that the tubes may be spaced the standard minimum distance apart and yet allow sufficient room for the stays.

Having now particularlyT described my nvention, I'hereby declare 'that what I claim as new and desire to be protected in by Let- Aters Patent, is

l. A vertical multitubular boiler1 comprising a. shell which is laterally .tlattened in cross section throughout the entire height of the boiler`r a. lire-boxv within the lower part of the shell with a 'water space between it and the shell, means for staying the flattened sides of the shell to the fire-box, plate stays extending across 'between the flattened sides of the shell above the lire-box, said plate stays being` oi*l a height to extend from adjacent the top of the boiler to adjacent top of the lire-'box and tubes extending between the crown of the tire-box and the upper end plate ot the shell.

2. A vertical multitubular boiler, comprising a shell which is laterally7 'flattened in cross section throughout the entire height oi" the boiler, a eorrespondingl)T shaped fire-box secured within the lower part of the shell to maintain a water space between it and the shell, stays connecting the flattened sides ol' the shell to -those 'of the lire-box and above the fire-box plate stays connectingT the flattened sides of the shell together, said plate stays being of a height to extend trom adjacent the top ot' the boiler to adjacent the top of the tire-box and tubes between the crown of the tire-box and the upper end plate of the shell.

In testimony whereof I aliix my signature.

HAROLD J. Mz-VVFHEXVS. 

